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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Millions, except Share data, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 475.9 | $ 3.8 | $ 211.7 | $ (132.1) | $ 417.0 | $ (24.5)
Balance (in Shares) at Dec. 31, 2011 |  | 37,587,298 |  | 5,220,414 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 63.3 |  |  |  | 63.3 |
Other comprehensive income (loss), net of tax | 1.2 |  |  |  |  | 1.2
Dividends declared | (9.4) |  |  |  | (9.4) |
Restricted stock issuances, net | 0 |  | (3.4) | 3.4 |  |
Restricted stock issuances, net (in shares) |  |  |  | (137,026) |  |
Stock-based employee compensation expense | 4.5 |  | 4.5 |  |  |
Excess tax benefits of stock-based employee compensation | 0.1 |  | 0.1 |  |  |
Stock issued to directors as compensation | 0 |  | 0 |  |  |
Stock issued to directors as compensation (in shares) |  | 1,324 |  |  |  |
Issuance of shares for options exercised | 0.1 |  | 0.1 |  |  |
Issuance of shares for options exercised (in shares) |  | 11,100 |  | 0 |  |
Purchases of treasury stock | (50.0) |  |  | (50.0) |  |
Purchases of treasury stock (in shares) |  |  |  | 1,481,482 |  |
Stockholders' Equity, Other Shares |  | (6,556,110) |  |  |  |
Stock Issued During Period, Value, Stock Dividend |  | (0.7) |  |  | 0.7 |
Stock Issued During Period, Value, Treasury Stock Reissued | 0 |  | (178.4) | 178.4 |  |
Stock Issued During Period, Shares, Treasury Stock Reissued |  |  |  | (6,556,110) |  |
Balance at Sep. 30, 2012 | 485.7 | 3.1 | 34.6 | (0.3) | 471.6 | (23.3)
Balance (in Shares) at Sep. 30, 2012 |  | 31,043,612 |  | 8,760 |  |
Balance at Dec. 31, 2012 | 511.8 | 3.1 | 41.0 | (0.3) | 483.4 | (15.4)
Balance (in Shares) at Dec. 31, 2012 |  | 31,209,866 |  | 8,760 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 85.8 |  |  |  | 85.8 |
Other comprehensive income (loss), net of tax | (3.5) |  |  |  |  | (3.5)
Dividends declared | (28.3) |  |  |  | (28.3) |
Restricted stock issuances, net | 0 |  | (0.2) | 0.2 |  |
Restricted stock issuances, net (in shares) |  | 214,461 |  | (5,000) |  |
Stock-based employee compensation expense | 2.0 |  | 2.0 |  |  |
Excess tax benefits of stock-based employee compensation | 0.5 |  | 0.5 |  |  |
Stock issued to directors as compensation | 0.1 |  | 0.1 |  |  |
Stock issued to directors as compensation (in shares) |  | 1,071 |  |  |  |
Issuance of shares for options exercised | 0.3 |  | 0.3 |  |  |
Stock Repurchased and Retired During Period, Shares |  | (47,218) |  | (47,218) |  |
Treasury Stock, Retired, Cost Method, Amount | 0 |  | (1.8) | 1.8 |  |
Issuance of shares for options exercised (in shares) |  | 21,000 |  |  |  |
Purchases of treasury stock | (1.7) |  |  | (1.7) |  |
Purchases of treasury stock (in shares) |  |  |  | 43,458 |  |
Balance at Sep. 30, 2013 | $ 567.0 | $ 3.1 | $ 41.9 | $ 0 | $ 540.9 | $ (18.9)
Balance (in Shares) at Sep. 30, 2013 |  | 31,399,180 |  | 0 |  |

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